You will need an internet connection to activate Z&oumldlr. After downloading Z&oumldlr, you will receive a license key by email (check your spam folder if this email does not appear in your inbox). After installing Z&oumldlr, open Excel, activate Z&oumldlr from Excel's Add-In ribbon, and paste this license key into the License Activation Form. This will activate your personal copy of Z&oumldlr. Enjoy Z&oumldlr!